A commercial electric fan blade
An electric fan and fan blade technology, which is applied to the components of the pumping device for elastic fluid, non-variable-capacity pumps, pump components, etc. The effect of noise reduction is obvious and the effect of reducing resistance
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no. 1 example
[0032] see Figure 1-Figure 5 The diameter of the commercial electric fan blade of the present embodiment is 16 inches, and the blade includes a hub 1 and four blades 2 arranged on the peripheral side of the hub 1, the root of the blade 2 is connected with the hub 1, and the blade 2 starts from the root Radially twisted and extended, each blade 2 is rotationally symmetrical and circularly distributed; the root of the blade 2 is inclined relative to the rotation axis of the hub 1, and the angle c between each other is 68°-88°; the blade 2 is twisted with a windward area 2.1 and a wind gathering area. Area 2.2, windward area 2.1 and wind gathering area 2.2 are arranged obliquely respectively, and the inclination angle e of wind gathering area 2.2 is greater than the inclination angle d of windward area 2.1, and wind gathering area 2.2 is located at the rear side of windward area 2.1, and the inclination angle of windward area 2.1 d is 5°-20°, and the inclination angle e of the w...
no. 2 example
[0041] see Figure 6-Figure 9 , the diameter of the commercial electric fan blade involved in this embodiment is 18 inches, and it is different from the first embodiment in that: in the same blade, the included angle c is 74°, the inclination angle d is 13°, and the inclination angle e is 34°; the hub 1 and the blade 2 are integrally injection molded by plastic, and the middle part of the hub 1 is formed with a spline structure 1.3.
[0042] Furthermore, the included angle f between the connecting line L1 and the connecting line L2 is 31°; the included angle g between the connecting line L1 and the connecting line L3 is 37°. in addition, Figure 7 The section line in the B'-B' direction is the section line passing through the wind gathering point 3 on the blade 2 and perpendicular to the connecting line L3.
[0043] Other parts not described are the same as those of the first embodiment, and will not be analyzed and described here.
no. 3 example
[0045] see Figure 10-Figure 13 , the diameter of the commercial electric fan blade involved in this embodiment is 20 inches, and it is different from the first embodiment in that: in the same blade, the included angle c is 78°, the inclination angle d is 10°, and the inclination angle e is 30°; the hub 1 and the blade 2 are integrally injection molded by plastic, and the middle part of the hub 1 is formed with a spline structure 1.3.
[0046] Furthermore, the included angle f between the connecting line L1 and the connecting line L2 is 21°; the included angle g between the connecting line L1 and the connecting line L3 is 40°. in addition, Figure 7 The section line in the B"-B" direction is the section line that passes through the wind gathering point 3 on the blade 2 and is perpendicular to the connecting line L3.
[0047] Other parts not described are the same as those of the first embodiment, and will not be analyzed and described here.
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